Order data on Datum > Lijn property

index.php

@@ -42,10 +42,11 @@
 	crossorigin="anonymous"></script>
 <script src="//cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
 <script src="//stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
+<!--suppress JSUnresolvedVariable -->
 <script>
     $.getJSON('payload.json', (data) => {
         console.log(data);
-        data.sort((a, b) => a.Lijn > b.Lijn ? 1 : -1);
+        data.sort((a, b) => a.Lijn > b.Lijn ? 1 : (a.Datum === b.Datum) ? ((a.Lijn > b.Lijn) ? 1 : -1) : -1);
         let items = [];
         $.each(data, (key, val) => {
             console.log('key:', key, ' val:', val);